Diaphragm compressor



Nov. 24, 1925.

H. coRBLJN DIABHRAGM COMPRESSOR Filed Sept. 20, 1923 s i. HHH. \M

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HENRJK CORBLIN, OJE BMI, FRANCE.

DMPHRAGM COMPRESSUR.

Application filed September 20, 1923. aerial No. 663,821.

To all 'whom t may concern:

Be it known that li, HnNnr CORBLIN, a citizen ot' the Republic of France, and a resident of Paris, France, have invented new and useful improvements in Diaphragm lompressors, of which the following is a specification.

rlFhis invention relates to diaphragm compressors, more particularly intended for the compression ofgases, of the type in which a diaphragm oscillates in a chamber having the general shape of a double cone, formed between two discs between which the diaphragm is secured.

Hitherto, with a view to pressing the diaphragm as accurately as possible against the surface of thedisc carrying the suction and delivery valves, and thus obviating the formation ot any objectionable clearance space, it has been sought to 4make the pump actuating the diaphragm displace a volume of liquid greater than that generated by the 'diaphragm'between its two extreme positions in the compression chamber, that is to say when it is pressed against the lower and the upper discs respectively.

' ample.

" Way as to allow rlihis result has been obtained, for eX as described in my United States Letters ,Patent No. 1,332,806, of March 2, 1920, by making the piston itselt act as reservoir for the liquid and by fitting with av lift-valve arranged so as to open at a given pressure and a snit'ter arranged so as to open at a given vacuum, in such a of passing a portion ot the liquid at `a given pressure from the compression chamber into the reservoirfoi-ming piston and vice versa.

According to the present invention, the volume of the compression chamber is greater than that generated by the stroke ot' the piston which causes the diaphragm to oscillate by the action of the liquid, and

in order that the diaphragm may be pressed against the lower disc at the end of the delivery stroke of the piston, there is injected into the body or barrel of the pump during the stroke of the piston, either on the delivery or preferably on the suction stroke, a very small quantity oi liquid which makes up -for the leaks between the piston and the pump barrel, as well as the clearance that may exist or arise in the connectng rod ends, in the bearings, etc. For this purpose, a small pump with variable output, coupled to the crankshaft ot' the compressor piston, delivers to the pump barrel the necessary quantity of liquid, this auxiliary pump taking up by suction the liquid which escapes from the main pump,

either at the end of its deliveryv stroke through the valve mounted in the piston, or owing to leakage of the packing rings on the latter.

rll`he liquid is with advantage cooled in any suitable manner before being delivered by the auxiliary pump into the barrel or cylinder of the compressor piston.

rlFhe accompanying drawing represents diagrammatically and in vertical axial section, but merely by way of example, one form of construction of the invention.

The compressor comprises two discs a b, bolted together at their peripheries, between which is clamped the diaphragm o, the latter being adapted to oscillate in the compression chamber Z which has the general shape of a double-cone and is formed between tlie two discs a, and b; the lower disc a carries the suction valve e and delivery valve f, operated by the displacement of the diaphragm c in the chamber b. This diaphragm is itself operated by the piston z displacing in the pump barrel i a volume of liquid, for example oil, actin@ upon the upper face of the diaphragm olly passing through openings b1 formed in the central part of the upper disc b.

The piston` h comprises a lift-valve r the pump body or barrel z is connected by a pipe il to a reservoir 7c which in turn is connected by a pipe k1 to the suction of a small auxiliary pump Z, having its piston m operated by the crank shaft (not shown in the drawing) which works the main compressor pistion h. The delivery of this auxiliary pump Z is connected by the pipe Z1 to the pump barrel of the compressor.

The volume swept ontI by 'the stroke of the piston it is less than that of the compression chamber d. In order to complete this volunie, so that at the end of the delivery stroke of the piston z, the diaphragm c shall be pressed accurately against the disc a carrying the valves e f, there is injected into the pump-barrel i beneath the piston h, and through the pipe Z1 from the auxiliary pump 7, a very small quantity of liquid.

At each stroke of the piston 7L, the liquid thus injected escapes either as a result of the leaks at the piston rings, or through the valve 711 in this piston. The excess liquid,

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entering `the reservoir lo, is taken upy again by the. auxiliary pump Z through the pipe lo* and the suction valve la, being thereafter delivered at the requiredmoment through the valve Z2- and the pipeiz1 into the pump barrel.

This added quantity of liquid, which can be regulated by varying the stroke of the piston m, is injected beneath the main piston either durin the delivery stroke-of the latter, or pre erably during the suction stroke. l 4 4 The liquid coming vfrom the reservoir la, having been heated inthe pump barrel i and through the diaphragm c by the compression of the gas, is cooledY in any convenient manner before entering the auxiliary pump l.

and before beingdelivered into the pump Y barrel 5;' for example, a contra-How eoolern tion allows of sup ressing the snifter, the

may be provided in the line of' the pipe kland in advance of the suction valve [c2` of the auxiliary pump.

The 'arrangement according to the invenf return spring of w ich is dilicult to adjust conveniently, and also the variation of the stroke of the compressor piston;

.What Iv claim is: l

1. 'In a diaphragm compressor, ofthe type in which a pump piston produces, ,b means 1 of 4a body of liquid, oscillations o a daphragm in a chamber of general bi-conical shape, -formed between two discs between lsmall auxiliary the main pump message which the diaphragm is secured, one of said discs carrying the suction and delivery valvesr-the'provision of a main pump piston, adapted to generate a volume less than that of the compression chamber, and of a pump, adapted to inject into piston, a small quantity of liquid necessary to complete the volume of the compression chamber and to press the diaphragm against the disc, carrying'the valves.

arrel, at every stroke of the 2. In a diaphragm compressor, of the type lthat of the oompressionJchamber, and of a small auxiliary,l pump, adapted to inject into the main pump barrel on the side lremote from the piston rod, at every suction stroke of the piston, a small quantity of liquid ynecessary to complete the volume of the compression chamber, and to press the l difphragm against the disc carrying the Ava ves.

In testimony whereof I have signed my name to this specification.

HENRI CORB'LIN, 

